package com.meng.message.controller.login;


import com.google.code.kaptcha.Producer;
import io.swagger.annotations.Api;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**
 * @author: Xu Meng
 * @program: minions-cloud
 * @create: 2021-01-27 17:15
 **/
@Api(tags = "验证码接口")
@Controller
@Slf4j
public class CaptchaController {
    public static final String KEY_CAPTCHA = "KEY_CAPTCHA";

    @Autowired
    private Producer captchaProducer;

    @GetMapping("/captcha.jpg")
    public void getCaptcha(@RequestParam(value = "t", required = false) String t,
                           HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setDateHeader("Expires", 0);
        // Set standard HTTP/1.1 no-cache headers.
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        // Set standard HTTP/1.0 no-cache header.
        response.setHeader("Pragma", "no-cache");
        // return a jpeg
        response.setContentType("image/jpeg");
        // create the text for the image
        String capText = captchaProducer.createText();
        //将验证码存到session
        request.getSession().setAttribute(KEY_CAPTCHA, capText);
        //log.info(capText);
        // create the image with the text
        BufferedImage bi = captchaProducer.createImage(capText);
        ServletOutputStream out = response.getOutputStream();
        // write the data out
        ImageIO.write(bi, "jpg", out);
        try {
            out.flush();
        } finally {
            out.close();
        }
    }
}
